Cover Image

A note on Keldysh's perturbation formalism

The expansion theorem of quantum field theoy relating Heisenberg operators to asymptotic free-field operators is rewritten by means of the time-path technique, originally due to Schwinger, which to date has only found application in statistical mechanics. The theorem is combined with Bogoliubov's initial condition of vanishing correlations in the infinite past to rederive Keldysh's perturbation scheme for non-equilibrium statistical Green's functions.
Year of publication:
1979
Authors: de Boer, W.P.H. ; Van Weert, CH.G.
Published in:
Physica A: Statistical Mechanics and its Applications. - Elsevier, ISSN 0378-4371. - Vol. 98.1979, 3, p. 579-586
Publisher: Elsevier
Type of publication: Article
Source:
Persistent link: https://www.econbiz.de/10010585352
Similar items by person